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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f1e03b1d076fa81658d7c9087eb2f8bcabe2e1dfba03fd8a40a7bb7a6bfe81' 
  AND token = 'Hnja+BNwl2sSRavfBSx7oFuFq9ADlKeTq07/kPjGTHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}